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Bank segment (Details 4) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Available-for-sale securities    
Total available-for-sale securities, Amortized cost $ 534,876 $ 535,090
Gross unrealized gains 5,958 6,911
Gross unrealized losses (9,231) (12,994)
Available-for-sale securities 531,603 529,007
Available-for-sale Securities, Continuous Unrealized Loss Position    
Fair value, less than 12 months 119,030 313,820
Gross unrealized losses, less than 12 months (1,047) (11,353)
Fair value, 12 months or longer 177,712 19,655
Gross unrealized losses, 12 months or longer (8,184) (1,641)
Federal agency obligations
    
Available-for-sale securities    
Total available-for-sale securities, Amortized cost 107,072 83,193
Gross unrealized gains 631 174
Gross unrealized losses (1,407) (2,394)
Available-for-sale securities 106,296 80,973
Available-for-sale Securities, Continuous Unrealized Loss Position    
Fair value, less than 12 months 29,628 70,799
Gross unrealized losses, less than 12 months (137) (2,394)
Fair value, 12 months or longer 29,168 0
Gross unrealized losses, 12 months or longer (1,270) 0
Mortgage-related securities - FNMA, FHLMC and GNMA
    
Available-for-sale securities    
Total available-for-sale securities, Amortized cost 427,804 374,993
Gross unrealized gains 5,327 4,911
Gross unrealized losses (7,824) (10,460)
Available-for-sale securities 425,307 369,444
Available-for-sale Securities, Continuous Unrealized Loss Position    
Fair value, less than 12 months 89,402 228,543
Gross unrealized losses, less than 12 months (910) (8,819)
Fair value, 12 months or longer 148,544 19,655
Gross unrealized losses, 12 months or longer (6,914) (1,641)
Municipal bonds
    
Available-for-sale securities    
Total available-for-sale securities, Amortized cost 0 76,904
Gross unrealized gains 0 1,826
Gross unrealized losses 0 (140)
Available-for-sale securities 0 78,590
Available-for-sale Securities, Continuous Unrealized Loss Position    
Fair value, less than 12 months 0 14,478
Gross unrealized losses, less than 12 months 0 (140)
Fair value, 12 months or longer 0 0
Gross unrealized losses, 12 months or longer $ 0 $ 0